Re: a problem using boost.Lambda

From:
"Daniel T." <daniel_t@earthlink.net>
Newsgroups:
comp.lang.c++.moderated
Date:
Mon, 6 Aug 2007 16:15:41 CST
Message-ID:
<daniel_t-9B06B9.15360506082007@news.west.earthlink.net>
In article <1186380625.153078.216900@d30g2000prg.googlegroups.com>,
 "xuminggang@gmail.com" <xuminggang@gmail.com> wrote:

I want to use an int container && an double container to construct a
Foo type container, so I used the following code, but it doesn't
compile. What's the problem with my code?besides, I'm new to
boost.Lambda but I really like boost.

struct Foo
{
    Foo(int i, double d)
    {

    }
};

int _tmain(int argc, _TCHAR* argv[])
{
    using namespace boost::lambda;
    std::vector<int> int_vec;
    int_vec.push_back(1);
    int_vec.push_back(2);

    std::vector<double> db_vec;
    db_vec.push_back(1.2);
    db_vec.push_back(2.3);

    std::vector<Foo> foo_vec;

    std::transform(int_vec.begin(), int_vec.end(), db_vec.begin(),
std::back_inserter(foo_vec), Foo(_1, _2));

    return 0;
}


Constructors have to be treated special. Look in the docs under
"Construction and destruction".

Try this instead:

   std::transform(int_vec.begin(), int_vec.end(),
         db_vec.begin(),
         std::back_inserter(foo_vec),
         bind(constructor<Foo>(), _1, _2));

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